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Question

(C) Magnesium $(Mg)$ is a highly reactive metal. Electrolysis of an aqueous solution of $MgCl_2$ results in the evolution of $H_2$ gas at the cathode

Vedclass · Accepted Answer

Electrolysis of molten state of $MgCl_2$

Vedclass · Answer

(C) Magnesium $(Mg)$ is a highly reactive metal. Electrolysis of an aqueous solution of $MgCl_2$ results in the evolution of $H_2$ gas at the cathode because the reduction potential of water is higher than that of $Mg^{2+}$ ions. Direct heating of $MgCl_2 \cdot 6H_2O$ leads to hydrolysis,producing $MgO$ $(MgCl_2 \cdot 6H_2O \xrightarrow{\Delta} MgO + 2HCl + 5H_2O)$. Therefore,$Mg$ is obtained by the electrolysis of molten $MgCl_2$ (often mixed with $NaCl$ and $CaCl_2$ to lower the melting point and increase conductivity).

$Mg$ is obtained by:

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